TC1775 Datasheet, PDF (64/101 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

Preliminary
Recommended Oscillator Circuits
V _{DDO SC}
XTAL1
1-16
MHz
TC1775
M a in
Oscillator
XTAL2
C₁
C₂
V _SSOSC
TC1775
V _DDOSC
External
Clock Signal
XTAL1
TC1775
M a in
Oscillator
XTAL2
V _DD
V _{SSO SC}
M C S04714
XTAL3
32.768
kHz
TC1775
RTC
Oscillator
XTAL4
C₁
C₂
V _SS
M C S04716
Figure 19 Oscillator Circuitries
For the main oscillator of the TC1775 the following external passive components are
recommended:
– Crystal: max. 16 MHz
– C₁, C₂: 10 pF
A block capacitor between V_DDOSC and V_SSOSC is recommended, too.
For the RTC oscillator of the TC1775 the following external passive components are
recommended:
– Crystal: 32.768 kHz
– C₁, C₂: 12 pF
Note: For crystal operation, it is strongly recommended to measure the negative
resistance in the final target system (layout) to determine the optimum parameters
for the oscillator operation. Please refer to the minimum and maximum values of
the negative resistance specified by the crystal supplier.
Data Sheet
60
V1.2, 2002-05